Process of making pronged rivets



(No Model.)

.W. G. BRAY. PROCESS OF MAKING PRONGED RIVETS. No. 428,826. Patented May27, 1890.

, UNITED STATES PATENT OFFICE.

WILLIAM C. BRAY, OF NEWTON, MASSACHUSETTS.

PROCESS OF MAKING PRONGED RIVETS.

SPECIFICATION forming part of Letters Patent No. 428,826, dated May 27,1890.

Application filed April 1, 1890-v Serial No. 346,154. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM C. BRAY, of Newton, in the county ofMiddlesex and State of Massachusetts, have invented a new and usefulProcess of Making Pronged Rivets, of

- which the following, taken in connection with the accompanyingdrawings, is a specification.

My invention relates to the manufacture of pronged rivets; and itconsists in an improved process of making pronged rivets, which will bereadily understood by reference to the description of the accompanyingdrawings, and to the claims hereinafter given, and in which my inventionis clearly pointed out.

Figure 1 of the drawings is a planof a short section of wire as itappears after it has been subjected to pressure between two dies toswage or emboss thereon the outline of two blanks. Fig. 2 is anelevation of the same. Fig. 3 represents a plan of one blank before thefin has been removed. Fig. 4 is a plan, Fig. 5 an inverted plan, andFig. 6 is a longitudinal section, of the blank after the fin is removed.Fig. 7 is a central longitudinal section of one form of a rivetproduced. by my improved process. Figs. 8, 9, and 10 are respectively anelevationlooking at V the edges of the prongs, an elevation viewed atright angles to Fig. 8, and a central vertical section of another formof rivet produced by my improved process; and Fig. 11 illustratestransverse sections of three different styles or kinds of wire fromwhich the blanks maybe swaged.

In carrying out my improved process of making pronged rivets I take awire of soft iron or brass, either round, oval, or rectangular incross-section, as shown in Fig. 11, and subject it to pressure betweensuitably-shaped dies to swage it into the desired shape to form theblank A. When removed from between the dies, after being subjected tothe action thereof, the blank will have a thin fin a of metal projectingtherefrom, as shown in Figs. 1, 2, and 3, which is next removed by meansof a male and female die, when the blank will appear as shown in Figs.4, 5, and 6. The blank is then subjected to the action ofsuitably-shaped male and female dies to bend the prongs b b of saidblank into a position at right angles to the head a, as shown in Fig. 7.

If it is desired to form the rivet shown in Figs. 8, 9, and 10, theprongs are forced inward bodily toward each other'to the position shownin Figs. 8 and 10 by means of suitable dies and a pressure applied in adirection at right angles to the length of said prongs.

By this process I am enabled to form a rivet from solid wire, providedwith a head having a convex upper surface and a fiat under surface, giveto the prongs any desired cross-section and any degree or kind of taper,and bend the prongs under the head, so as to project therefrom at rightangles to its fiat face at the extreme edge of the head, as shown inFig. 7, or at points removed therefrom toward the center of said head,as shown in Figs. 8 and 10, without the use of cutting, or milling, ordrilling tools, except the dies for removing the fin, and as aconsequence the rivets can be produced very cheaply.

This process has been partially described, but not claimed, in two otherapplications of mine of even date herewith.

WVhat I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. The process of making pronged rivets from solid wire, which consistsin swaging a section of wire to form a blank comprising a head and twoprongs projecting from opposite sides of. said head in a plane parallelto to the under surface of the head, and give said blank the desiredtransverse sections, then trimming the fin from said blank, and thenbending the prongs under the head and into positions at right angles tothe under surface of the head, and their outer surfaces at a distanceapart equal to the diameter of the head.

2. The process of making pronged rivets from solid wire, which consistsin swaging a section of the wire to form a blank having the desiredcross-section of prong and head, with said prongs extending fromopposite sides of said head and in a plane parallel to the under surfaceof the head, removing the fin from said blank, bending said prongs atright angles to the under side of the head, name to this specification,in the presence of with their outer surfaces at a distance apart twosubscribing Witnesses, on this 28th day 10 equal to the diameter of thehead, and then of March, A. D. 1890. moving the greater part of saidprongs bodily T I V T 5 toward each other and folding a portion ILLIAMLEAK thereof next to the head under said head, lVitnesses: substantiallyas described. N. C. LOMBARD,

In testimony whereof I have signed my XVALTER E. LOMBARD.

